High-quality sapphire material has a series of characteristics such as high strength, high hardness, high temperature resistance, abrasion resistance,corrosion resistance, good light transmission performance (in the 170nm ~ 6000 nm), excellent electrical insulation performance, and good mechanical properties.' The chemical performance is very stable, free from acid and alkali corrosion. The hardness of sapphire is high, with Mohs hardness level 9, second only to diamond (level 10).

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